I am working today on getting cross-platform syncing working for Postalgic blogs. So when you upload your blog, it uploads a syncable version as well, with your draft posts encrypted with a choosable password. Then you can have your blog in multiple clients and the 'cloud storage' of your blog is just your site storage. So far I've gotten it working for uploading the sync data and importing a blog from the sync data in the new self-hosted version. Just need to QA the iOS side of that and keep going...